Mac-10 9mm Or .45 Acp Recoil Spring

This Mac-10 recoil spring/compression spring will replace your worn out spring. This should be replaced after 5,000. rounds or when ever you notice your weapon have trouble discharging brass. A worn out spring may create problems with the stroke of the bolt. (spring only other parts sold separately)**Tell us in the comments section of your order if you need either a 9mm or .45 recoil spring.